From: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Adding packet and byte quota support. Once a quota has been
reached a noticifaction is sent to user space that includes
the name of the accounting object along with the current byte
and packet count.
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
---
include/linux/netfilter/nfnetlink_acct.h | 11 ++-
include/uapi/linux/netfilter/nfnetlink.h | 2 +
include/uapi/linux/netfilter/nfnetlink_acct.h | 1 +
include/uapi/linux/netfilter/xt_nfacct.h | 15 ++++
net/netfilter/Kconfig | 3 +-
net/netfilter/nfnetlink_acct.c | 35 ++++++---
net/netfilter/xt_nfacct.c | 108 +++++++++++++++++++++++---
7 files changed, 152 insertions(+), 23 deletions(-)
diff --git a/include/linux/netfilter/nfnetlink_acct.h b/include/linux/netfilter/nfnetlink_acct.h
index b2e85e5..490b83e 100644
--- a/include/linux/netfilter/nfnetlink_acct.h
+++ b/include/linux/netfilter/nfnetlink_acct.h
@@ -3,11 +3,18 @@
#include <uapi/linux/netfilter/nfnetlink_acct.h>
-
-struct nf_acct;
+struct nf_acct {
+ atomic64_t pkts;
+ atomic64_t bytes;
+ struct list_head head;
+ atomic_t refcnt;
+ char name[NFACCT_NAME_MAX];
+ struct rcu_head rcu_head;
+};
struct nf_acct *nfnl_acct_find_get(const char *filter_name);
void nfnl_acct_put(struct nf_acct *acct);
void nfnl_acct_update(const struct sk_buff *skb, struct nf_acct *nfacct);
+void nfnl_quota_event(struct nf_acct *cur);
#endif /* _NFNL_ACCT_H */
diff --git a/include/uapi/linux/netfilter/nfnetlink.h b/include/uapi/linux/netfilter/nfnetlink.h
index 596ddd4..354a7e5 100644
--- a/include/uapi/linux/netfilter/nfnetlink.h
+++ b/include/uapi/linux/netfilter/nfnetlink.h
@@ -20,6 +20,8 @@ enum nfnetlink_groups {
#define NFNLGRP_CONNTRACK_EXP_DESTROY NFNLGRP_CONNTRACK_EXP_DESTROY
NFNLGRP_NFTABLES,
#define NFNLGRP_NFTABLES NFNLGRP_NFTABLES
+ NFNLGRP_ACCT_QUOTA,
+#define NFNLGRP_ACCT_QUOTA NFNLGRP_ACCT_QUOTA
__NFNLGRP_MAX,
};
#define NFNLGRP_MAX (__NFNLGRP_MAX - 1)
diff --git a/include/uapi/linux/netfilter/nfnetlink_acct.h b/include/uapi/linux/netfilter/nfnetlink_acct.h
index c7b6269..ae8ea0a 100644
--- a/include/uapi/linux/netfilter/nfnetlink_acct.h
+++ b/include/uapi/linux/netfilter/nfnetlink_acct.h
@@ -19,6 +19,7 @@ enum nfnl_acct_type {
NFACCT_PKTS,
NFACCT_BYTES,
NFACCT_USE,
+ NFACCT_QUOTA,
__NFACCT_MAX
};
#define NFACCT_MAX (__NFACCT_MAX - 1)
diff --git a/include/uapi/linux/netfilter/xt_nfacct.h b/include/uapi/linux/netfilter/xt_nfacct.h
index 3e19c8a..23f536c 100644
--- a/include/uapi/linux/netfilter/xt_nfacct.h
+++ b/include/uapi/linux/netfilter/xt_nfacct.h
@@ -3,11 +3,26 @@
#include <linux/netfilter/nfnetlink_acct.h>
+enum xt_quota_flags {
+ XT_NFACCT_QUOTA_PKTS = 1 << 0,
+ XT_NFACCT_QUOTA = 1 << 1,
+};
+
struct nf_acct;
+struct nf_acct_quota;
struct xt_nfacct_match_info {
char name[NFACCT_NAME_MAX];
struct nf_acct *nfacct;
};
+struct xt_nfacct_match_info_v1 {
+ char name[NFACCT_NAME_MAX];
+ struct nf_acct *nfacct;
+
+ __u32 flags;
+ __aligned_u64 quota;
+ /* used internally by kernel */
+ struct nf_acct_quota *priv __attribute__((aligned(8)));
+};
#endif /* _XT_NFACCT_MATCH_H */
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 748f304..ce184951 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -1108,7 +1108,8 @@ config NETFILTER_XT_MATCH_NFACCT
select NETFILTER_NETLINK_ACCT
help
This option allows you to use the extended accounting through
- nfnetlink_acct.
+ nfnetlink_acct. It is also possible to add quotas at the
+ packet and byte level.
To compile it as a module, choose M here. If unsure, say N.
diff --git a/net/netfilter/nfnetlink_acct.c b/net/netfilter/nfnetlink_acct.c
index c7b6d46..d825f60 100644
--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -29,15 +29,6 @@ MODULE_DESCRIPTION("nfacct: Extended Netfilter accounting infrastructure");
static LIST_HEAD(nfnl_acct_list);
-struct nf_acct {
- atomic64_t pkts;
- atomic64_t bytes;
- struct list_head head;
- atomic_t refcnt;
- char name[NFACCT_NAME_MAX];
- struct rcu_head rcu_head;
-};
-
static int
nfnl_acct_new(struct sock *nfnl, struct sk_buff *skb,
const struct nlmsghdr *nlh, const struct nlattr * const tb[])
@@ -92,7 +83,7 @@ nfnl_acct_new(struct sock *nfnl, struct sk_buff *skb,
return 0;
}
-static int
+int
nfnl_acct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
int event, struct nf_acct *acct)
{
@@ -134,6 +125,7 @@ nla_put_failure:
nlmsg_cancel(skb, nlh);
return -1;
}
+EXPORT_SYMBOL_GPL(nfnl_acct_fill_info);
static int
nfnl_acct_dump(struct sk_buff *skb, struct netlink_callback *cb)
@@ -336,6 +328,29 @@ void nfnl_acct_update(const struct sk_buff *skb, struct nf_acct *nfacct)
}
EXPORT_SYMBOL_GPL(nfnl_acct_update);
+void
+nfnl_quota_event(struct nf_acct *cur)
+{
+ int ret;
+ struct sk_buff *skb;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
+ if (skb == NULL)
+ return;
+
+ ret = nfnl_acct_fill_info(skb, 0, 0, NFACCT_QUOTA,
+ NFNL_MSG_ACCT_NEW, cur);
+
+ if (ret <= 0) {
+ kfree_skb(skb);
+ return;
+ }
+
+ netlink_broadcast(init_net.nfnl, skb, 0,
+ NFNLGRP_ACCT_QUOTA, GFP_ATOMIC);
+}
+EXPORT_SYMBOL_GPL(nfnl_quota_event);
+
static int __init nfnl_acct_init(void)
{
int ret;
diff --git a/net/netfilter/xt_nfacct.c b/net/netfilter/xt_nfacct.c
index b3be0ef..c557620 100644
--- a/net/netfilter/xt_nfacct.c
+++ b/net/netfilter/xt_nfacct.c
@@ -8,9 +8,12 @@
*/
#include <linux/module.h>
#include <linux/skbuff.h>
+#include <linux/spinlock.h>
+#include <net/netlink.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nfnetlink_acct.h>
+#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/xt_nfacct.h>
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>");
@@ -19,6 +22,11 @@ MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_nfacct");
MODULE_ALIAS("ip6t_nfacct");
+struct nf_acct_quota {
+ spinlock_t lock;
+ bool quota_reached; /* true if quota has been reached. */
+};
+
static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_nfacct_match_info *info = par->targinfo;
@@ -28,6 +36,36 @@ static bool nfacct_mt(const struct sk_buff *skb, struct xt_action_param *par)
return true;
}
+static bool
+nfacct_mt_v1(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ u64 val;
+ const struct xt_nfacct_match_info_v1 *info = par->matchinfo;
+ bool ret = true;
+
+ nfnl_acct_update(skb, info->nfacct);
+
+ if (info->flags & XT_NFACCT_QUOTA) {
+ spin_lock_bh(&info->priv->lock);
+ val = (info->flags & XT_NFACCT_QUOTA_PKTS) ?
+ atomic64_read(&info->nfacct->pkts) :
+ atomic64_read(&info->nfacct->bytes);
+ if (val <= info->quota) {
+ ret = !ret;
+ info->priv->quota_reached = false;
+ }
+
+ if (val >= info->quota && !info->priv->quota_reached) {
+ info->priv->quota_reached = true;
+ nfnl_quota_event(info->nfacct);
+ }
+
+ spin_unlock_bh(&info->priv->lock);
+ }
+
+ return ret;
+}
+
static int
nfacct_mt_checkentry(const struct xt_mtchk_param *par)
{
@@ -44,6 +82,34 @@ nfacct_mt_checkentry(const struct xt_mtchk_param *par)
return 0;
}
+static int
+nfacct_mt_checkentry_v1(const struct xt_mtchk_param *par)
+{
+ struct xt_nfacct_match_info_v1 *info = par->matchinfo;
+ struct nf_acct *nfacct;
+
+ nfacct = nfnl_acct_find_get(info->name);
+ if (nfacct == NULL) {
+ pr_info("xt_nfacct: invalid accounting object `%s'\n",
+ info->name);
+ return -ENOENT;
+ }
+
+ info->nfacct = nfacct;
+
+ if ((info->flags & XT_NFACCT_QUOTA) && !info->priv) {
+ info->priv = kmalloc(sizeof(struct nf_acct_quota), GFP_KERNEL);
+ if (info->priv == NULL) {
+ nfnl_acct_put(info->nfacct);
+ return -ENOMEM;
+ }
+ spin_lock_init(&info->priv->lock);
+ info->priv->quota_reached = false;
+ }
+
+ return 0;
+}
+
static void
nfacct_mt_destroy(const struct xt_mtdtor_param *par)
{
@@ -52,24 +118,46 @@ nfacct_mt_destroy(const struct xt_mtdtor_param *par)
nfnl_acct_put(info->nfacct);
}
-static struct xt_match nfacct_mt_reg __read_mostly = {
- .name = "nfacct",
- .family = NFPROTO_UNSPEC,
- .checkentry = nfacct_mt_checkentry,
- .match = nfacct_mt,
- .destroy = nfacct_mt_destroy,
- .matchsize = sizeof(struct xt_nfacct_match_info),
- .me = THIS_MODULE,
+static void
+nfacct_mt_destroy_v1(const struct xt_mtdtor_param *par)
+{
+ const struct xt_nfacct_match_info_v1 *info = par->matchinfo;
+
+ nfnl_acct_put(info->nfacct);
+ kfree(info->priv);
+}
+
+static struct xt_match nfacct_mt_reg[] __read_mostly = {
+ {
+ .name = "nfacct",
+ .family = NFPROTO_UNSPEC,
+ .checkentry = nfacct_mt_checkentry,
+ .match = nfacct_mt,
+ .destroy = nfacct_mt_destroy,
+ .matchsize = sizeof(struct xt_nfacct_match_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .name = "nfacct",
+ .revision = 1,
+ .family = NFPROTO_UNSPEC,
+ .checkentry = nfacct_mt_checkentry_v1,
+ .match = nfacct_mt_v1,
+ .destroy = nfacct_mt_destroy_v1,
+ .matchsize = sizeof(struct xt_nfacct_match_info_v1),
+ .me = THIS_MODULE,
+ },
+
};
static int __init nfacct_mt_init(void)
{
- return xt_register_match(&nfacct_mt_reg);
+ return xt_register_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg));
}
static void __exit nfacct_mt_exit(void)
{
- xt_unregister_match(&nfacct_mt_reg);
+ xt_unregister_matches(nfacct_mt_reg, ARRAY_SIZE(nfacct_mt_reg));
}
module_init(nfacct_mt_init);
--
1.8.3.2
--
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